Journal
ADVANCED MATERIALS
Volume 32, Issue 40, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202003296
Keywords
ionic defects; interface passivation; low-dimensional perovskites; perovskite solar cells; quantum dot interdiffusion
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Funding
- Singapore National Research Foundation through the Intra-CREATE Collaborative Grant [NRF2018-ITC001-001]
- [M408070000]
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Realization of reduced ionic (cationic and anionic) defects at the surface and grain boundaries (GBs) of perovskite films is vital to boost the power conversion efficiency of organic-inorganic halide perovskite (OIHP) solar cells. Although numerous strategies have been developed, effective passivation still remains a great challenge due to the complexity and diversity of these defects. Herein, a solid-state interdiffusion process using multi-cation hybrid halide perovskite quantum dots (QDs) is introduced as a strategy to heal the ionic defects at the surface and GBs. It is found that the solid-state interdiffusion process leads to a reduction in OIHP shallow defects. In addition, Cs(+)distribution in QDs greatly influences the effectiveness of ionic defect passivation with significant enhancement to all photovoltaic performance characteristics observed on treating the solar cells with Cs-0.05(MA(0.17)FA(0.83))(0.95)PbBr3(abbreviated as QDs-Cs5). This enables power conversion efficiency (PCE) exceeding 21% to be achieved with more than 90% of its initial PCE retained on exposure to continuous illumination of more than 550 h.
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